On the Influence of Underhood Flow on External Aerodynamics of the DrivAer Model

Collin, Christopher; Müller, Jörg; Islam, Moni; Indinger, Thomas

doi:10.1007/978-3-319-67822-1_14

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…The time-averaged aerodynamic forces acting on the vehicle are compared with the measurement in the wind tunnel presented in (15). The force coefficients of drag , front lift and rear lift are presented in Fig.…”

Section: Results Of the Flow Simulationmentioning

confidence: 99%

“…(16) The DrivAer model was recently extended to reproduce engine bay flows to simulate more realistic operating conditions. (12)- (15) In this paper, we present a numerical simulation of the latest DrivAer notch-back model with closed rims and with engine bay flow according to the setup by Collin et al (15) In addition, the wheel house to the engine bay is opened. Experimental and numerical simulations for this setup are presented in (15), these are used for the validation of the simulation here.…”

Section: Numerical Flow Simulationmentioning

confidence: 99%

“…The radiator model installed in the engine bay causes a pressure drop of the incoming flow. Collin et al (15) reproduced the different pressure drop conditions in the experiment by changing the openness rate on the perforated plate installed just behind the front grill of the car. In the simulation, the effect on the incoming flow in the radiator is modeled by a pressure loss according to the Darcy-Forchheimer equation.…”

Section: Computational Setupsmentioning

confidence: 99%

“…In the simulation, the effect on the incoming flow in the radiator is modeled by a pressure loss according to the Darcy-Forchheimer equation. The coefficients are determined based on the measured pressure loss in the case of an experimental openness rate of Ao/Ac = 50.3% (15) .…”

Section: Computational Setupsmentioning

confidence: 99%

See 3 more Smart Citations

Application of Incremental Proper Orthogonal Decomposition for the Reduction of Very Large Transient Flow Field Data

Matsumoto

Kiewat

Niedermeier³

et al. 2019

IJAE

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With the increase of available computer performance, unsteady Computational Fluid Dynamics (CFD) is now widely used for industrial applications. For the analysis of unsteady vehicle aerodynamics, massive data storage is required for saving time series of spatially highly resolved flow fields. The size of these transient datasets can be significantly reduced using the Incremental Proper Orthogonal Decomposition (POD) by computing POD modes in parallel to the CFD. In this paper, we present a successful approximation of the transient flow field using a reduced number of modes computed by Incremental POD.

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Section: Results Of the Flow Simulationmentioning

confidence: 99%

Section: Numerical Flow Simulationmentioning

confidence: 99%

Section: Computational Setupsmentioning

confidence: 99%

Section: Computational Setupsmentioning

confidence: 99%

See 2 more Smart Citations

Application of Incremental Proper Orthogonal Decomposition for the Reduction of Very Large Transient Flow Field Data

Matsumoto

Kiewat

Niedermeier³

et al. 2019

IJAE

Self Cite

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“…Additionally, the interior underhood cooling and exhaust system was designed 2 to enable the investigation of the internal heat exchanges during the DrivAer's function, which have been researched both numerically and experimentally. [3][4][5] The influences of the ground effect caused by the relative movement of the ground and the vehicle, as well as the rotary motion of the wheels, are also important aspects if the aerodynamic behavior of a car, with studies evaluating the effect of ground simulation in the DrivAer model aerodynamics. 6,7 The need for minimizing fuel consumption and CO 2 emissions makes the aerodynamic study of the flow characteristics around automotive vehicles a necessary part of the design process.…”

Section: Introductionmentioning

confidence: 99%

Cost-effective numerical analysis of the DrivAer fastback model aerodynamics

Felekos

Douvi

Margaris

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper investigates cost-efficient ways of accurately numerically simulating the aerodynamic phenomena around the DrivAer model, a well-established conventional car reference model created by the Technical University of Münich (TUM). After processing the geometry of the Fastback configuration, a high quality ANSYS Poly-Hexcore mesh was constructed in ANSYS Fluent Meshing, reducing the number of cells needed for a highly accurate simulation. The grid independence study was conducted with the GCI method where convergence was achieved by a 10.5-million-cell mesh. The simulations were performed in ANSYS Fluent, where modeling using k-ε Realizable turbulence model, with Scalable wall functions and the SimpleC algorithm was chosen. The results showed good prediction of the drag and pressure coefficients, proving the accuracy and efficiency of the approach, while the flow and vortices were visualized and presented in the corresponding diagrams, being indicative of the aerodynamic structures around automotive vehicles.

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Experimental and Numerical Investigation of a Full-Sized Aerodynamic Vehicle Model in Relation to Its Production Car

Renz¹,

Krämer²

2021

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">In this paper, the differences between a production car of the 2018 A-class and an early stage vehicle model with a mostly similar outer skin are examined experimentally and numerically. The aerodynamic development of vehicles at Mercedes-Benz is divided into several phases. When comparing force coefficients differences can be observed between these distinct hardware stages as well as when comparing steady state simulations to wind tunnel measurements. In early phases when prototype vehicles are not yet available, so-called aero foam models are used. These are well-defined full-sized vehicle models, as the outer skin is milled from Polyurethane. Important aerodynamic characteristics such as a motor compartment with a cooling module, deflecting axles with rotatable wheels and underbody covers are represented. In order to close the gap between the aerodynamic reference body and the production vehicle we conducted a convergence study with a geometric alignment of the two vehicle phases to make them comparable. The vehicles were completely sealed afterwards which led to an only surrounding flow and a good convergence of the integral force values. Nevertheless, differences in the flow topology were found by means of total pressure measurements in the wake of the vehicles, mostly resulting from different geometric representations of underbody parts as shown by CFD. The influence of the different surface roughness on the general flow is negligible as proven by boundary layer measurements. By gradually increasing the flow through the vehicles again, measurement and simulation values show a different behavior of the two vehicles. Among the shown differences are the flow out of the motor compartments through various exits and the flow through gaps at underbody parts.</div></div>

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On the Influence of Underhood Flow on External Aerodynamics of the DrivAer Model

Cited by 3 publications

References 15 publications

Application of Incremental Proper Orthogonal Decomposition for the Reduction of Very Large Transient Flow Field Data

Application of Incremental Proper Orthogonal Decomposition for the Reduction of Very Large Transient Flow Field Data

Cost-effective numerical analysis of the DrivAer fastback model aerodynamics

Experimental and Numerical Investigation of a Full-Sized Aerodynamic Vehicle Model in Relation to Its Production Car

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